ST STM32U5 Nucleo-64 User manual

Introduction

The Nucleo-64 board based on the MB1841 reference board (NUCLEO-U545RE-Q) provides an affordable and flexible way

for users to try out new concepts and build prototypes by choosing from the various combinations of performance and power

consumption features, provided by the STM32U5 series microcontroller.

The ARDUINO® Uno V3 connectivity and the ST morpho headers provide easy expansion of the functionality of the STM32

Nucleo open development platform with a wide choice of specialized shields.

The STM32 Nucleo-64 board does not require any separate probe as it integrates the STLINK-V3EC debugger/programmer.

The STM32 Nucleo-64 board comes with the STM32 comprehensive free software libraries and examples available with the

STM32CubeU5 MCU Package.

Figure 1. Nucleo-64 board (top view)

Picture is not contractual.

STM32U5 Nucleo-64 board (MB1841)

UM3062

User manual

UM3062 - Rev 1 - April 2023

For further information contact your local STMicroelectronics sales office. www.st.com

1Features

• STM32 microcontroller in an LQFP 64‑pin package

• Internal SMPS(1) to generate Vcore logic supply, identified by '-Q' suffixed boards

• USB Type-C® sink device FS

• One user LED shared with ARDUINO® Uno V3

• RESET and USER push-buttons

• 32.768 kHz crystal oscillator

• Board connectors:

–USB Type-C®

–ARDUINO® Uno V3

– ST morpho extension pin headers for full access to all STM32 I/Os

• Flexible power-supply options: ST-LINK USB VBUS, user USB connector, or external sources

• On-board STLINK-V3EC debugger/programmer with USB re-enumeration capability: mass storage, Virtual

COM port, and debug port

• Comprehensive free software libraries and examples available with the STM32CubeU5 MCU Package

• Support of a wide choice of Integrated Development Environments (IDEs) including IAR Embedded

Workbench®, MDK-ARM, and STM32CubeIDE

1. SMPS significantly reduces power consumption in Run mode, by generating a Vcore logic supply from an internal DC/DC

converter.

Note: Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.

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Features

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2Ordering information

To order the Nucleo-64, refer to Table 1. Additional information is available from the datasheet and reference

manual of the target STM32.

Table 1. Ordering information

Order code Board reference Target STM32 Differentiating feature

NUCLEO-U545RE-Q MB1841 STM32U545RET6Q

Microcontroller featuring

512 Kbytes of flash memory

and 274 Kbytes of SRAM

2.1 Products and codification

The meaning of the codification is explained in Table 1.

Table 2. Codification explanation

NUCLEO-XXYYZE-Q Description Example: NUCLEO-U545RE-Q

XX MCU series in STM32 Arm Cortex MCUs STM32U5 series

YY MCU product line in the series STM32U535/U545

ZSTM32 package pin count:

• R for 64 pins 64 pins

ESTM32 flash memory size:

• E for 512 Kbytes 512 Kbytes

-Q STM32 has an internal SMPS function SMPS

The order code is mentioned on a sticker placed on the top or bottom side of the board.

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Ordering information

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3Development environment

3.1 System requirements

• Multi‑OS support: Windows® 10, Linux® 64-bit, or macOS®

• USB Type-A or USB Type-C® to USB Type-C® cable

Note: macOS® is a trademark of Apple Inc., registered in the U.S. and other countries and regions.

Linux® is a registered trademark of Linus Torvalds.

Windows is a trademark of the Microsoft group of companies.

3.2 Development toolchains

•IAR Systems® - IAR Embedded Workbench®(1)

•Keil® - MDK-ARM(1)

• STMicroelectronics - STM32CubeIDE

1. On Windows® only.

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Development environment

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4Conventions

Table 3 provides the conventions used for the ON and OFF settings in the present document.

Table 3. ON/OFF convention

Convention Definition

Jumper JPx ON Jumper fitted

Jumper JPx OFF Jumper not fitted

Jumper JPx [1-2] Jumper fitted between Pin 1 and Pin 2

Solder bridge SBx ON SBx connections closed by 0 Ω resistor

Solder bridge SBx OFF SBx connections left open

Resistor Rx ON Resistor soldered

Resistor Rx OFF Resistor not soldered

Capacitor Cx ON Capacitor soldered

Capacitor Cx OFF Capacitor not soldered

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Conventions

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5Quick start

The STM32 Nucleo-64 board is a low-cost and easy-to-use development kit, to quickly evaluate and start

development with an STM32U5 series microcontroller in an LQFP 64‑pin package. Before installing and using

the product, accept the Evaluation Product License Agreement from the www.st.com/epla webpage. For more

information on the STM32 Nucleo-64 board and for the software example, visit the www.st.com/stm32nucleo

webpage.

5.1 Getting started

Follow the sequence below to configure the Nucleo-64 board and launch the demonstration application (refer to

Figure 4 and Figure 5 for component location):

1. Check the jumper position on the board (refer to Default board configuration).

2. Connect the Nucleo-64 board to a PC with a USB cable (USB Type-A or USB Type-C® to USB Type-C®)

through the USB connector (CN1) to power the board.

3. The 5V_PWR green (LD3), COM (LD1), and PWR (LD4) LEDs light up, and the green LED (LD2) blinks.

4. Press the blue user button (B1).

5. Observe how the blinking of the LED (LD2) changes, according to the clicks on the button (B1).

6. Download the demonstration software and several software examples that help to use the STM32

Nucleo-64 features. These are available on the www.st.com website.

7. Develop your application using the available examples.

5.2 Default board configuration

By default, the Nucleo-64 board is configured with VDD_MCU at 3.3 V. It is possible to configure the board with

VDD_MCU at 1.8 V. Before switching to 1.8 V, ensure that the extension module and external shield connected to

the Nucleo-64 board are 1.8 V compatible.

The default jumper configuration and voltage setting are shown in Table 4.

Table 4. Default jumper configuration

Jumper Definition Default position Comment

JP1 Debugger selection OFF STLINK-V3EC is selected as the default

debugger.

JP2 STLK_NRST OFF STLINK-V3EC MCU is not under the

Reset mode.

JP3 5V power selection [1-2] 5V from STLINK-V3EC (STLK)

JP4 IDD measurement ON VDD_MCU current measurement

JP5 VDD [1-2] VDD voltage selection 3.3 V

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Quick start

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Figure 2. Default board configuration

JP3 [1-2]

JP5 [1-2]

3V3

JP4 [1-2]

STM32

microcontroller

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Default board configuration

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Table 5 explains the different jumper settings and configurations.

Table 5. Jumper configuration

Jumper Definition Setting(1) Comment

JP1 Debugger selection

[1-2]

An external debugger can be used on

the MIPI10 connector (CN4). The level

shifter (U2) is in high-Z. STLINK-V3EC

no longer drives the embedded STM32.

OFF STLINK-V3EC is selected as the

default debugger.

JP2 STLK_NRST

[1-2]

Can be used to reset the STLINK-V3EC

MCU when an external debug probe is

used. Thanks to the U2 level shifter and

JP1, it is not necessary to put STLINK-

V3EC in Reset mode when using an

external debug probe.

OFF Normal mode: Onboard STLINK-V3EC

debugger used

JP3 5V power selection(2)

[1-2] 5V source from STLINK-V3EC (CN1)

[3-4] 5V source from ARDUINO® VIN 7‑12 V

from CN6 or CN7

[5-6] 5V source from external 5V (E5V) from

CN6 or CN7

[7-8] 5V source from ST-LINK in USB charger

mode without USB negociation (CN1)

[9-10] 5V source from user USB Type-C®

(CN3)

OFF No 5V power source. Configuration

applied when external 3.3 V is used.

JP4 IDD measurement

ON VDD_MCU = VDD (3.3 or 1.8 V,

depending on JP5)

OFF

An ammeter is used to measure

VDD_MCU power consumption or a

3.3 or 1.8 V external source can

be connected on pin 2 (STLINK-PWR

tools with STM32CubeMonitor-Power or

ULPBench probe as examples)

JP5 VDD

[1-2] VDD voltage selection is 3V3 power

source.

[2-3] VDD voltage selection is 1V8 power

source

OFF No internal VDD power supply (3.3 or

1.8 V external voltage needed on pin 2)

1. The default configuration is in bold.

2. It is recommended to have only one jumper configuration.

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Default board configuration

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6Hardware layout and configuration

The STM32 Nucleo-64 board is designed around an STM32U5 microcontroller in an LQFP 64‑pin package.

Figure 3 shows the connections between the STM32 and its peripherals (STLINK-V3EC, push‑buttons, LEDs,

USB, ARDUINO® connectors, and ST morpho headers). Figure 4 and Figure 5 show the location of these

features on the STM32 Nucleo-64 board.

The mechanical dimensions of the board are shown in Figure 6.

Figure 3. Hardware block diagram

STLK-V3EC

STM32 MCU

OSC_32

SWD

32 KHz

crystal

VCP

UART

GPIOs

GPIO

LD2

GPIO

Embedded

STLK-V3EC

SWD

VCP

UART

USB-C®

connector

User B2

RST

ARDUINO®

ST morpho

GPIO

ARDUINO®

ST morpho

PWR SEL

LD3

PWR

JP1 Debug

SEL

JP2 STLK

NRST

STDC14

MIPI10

COM

3V3 / JP5 / 1V8JP4 IDD

USB-C®

connector

ARDUINO®

Note: • LS: Level Shifter

• VCP: Virtual COM port

• SWD: Serial Wire Debug

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Hardware layout and configuration

UM3062 - Rev 1 page 9/45

6.1 Nucleo-64 board layout

Figure 4. Nucleo-64 board top layout

STM32

microcontroller

STLK_NRST

(JP2)

USB STLINK-V3EC

(CN1)

Debugger selection

(JP1)

MIPI10

(CN14)

User button

(B1)

ST morpho connector

(CN7)

IDD jumper

(JP4)

STLK PWR LED

(LD4)

STLK COM LED

(LD1)

5V LED

(LD3)

5V jumper selection

(JP3)

Reset button

(B1)

ST morpho connector

(CN10)

VDD selection 3V3/1V8

(JP5)

ARDUINO® D[7-0]

(CN9)

USB-C® 5V LED

(LD6)

ARDUINO® D[15-8]

(CN5)

USB-C® connector

(CN3)

ARDUINO® ADC

(CN8)

ARDUINO® Power

(CN6)

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Nucleo-64 board layout

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